Liquid injection structure of battery and battery

Abstract

The utility model discloses a liquid injection structure of a battery and the battery, the liquid injection structure of the battery comprises a cover plate, a valve seat, an opening and closing piece and an elastic piece, and the cover plate is provided with a liquid injection hole; the valve seat is arranged on the inner side of the cover plate corresponding to the liquid injection hole, and at least one through hole is formed in the inner wall of the valve seat; the opening and closing piece is movably arranged in the valve seat; the elastic piece is arranged in the valve seat and applies acting force towards the liquid injection hole to the opening and closing piece, so that the opening and closing piece is kept in a closed state; when the opening and closing piece is in a closed state, the through hole is not communicated with the liquid injection hole; and when the opening and closing piece is subjected to external force overcoming the acting force applied by the elastic piece, the opening and closing piece is switched to an open state, so that at least one through hole is communicated with the liquid injection hole. According to the technical scheme, the battery production procedures are reduced, and the battery production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery liquid injection structure and a battery. Background Art

[0002] Some batteries need to be injected with electrolyte after packaging and after being used for a period of time. In order to achieve the injection, a through hole needs to be reserved on the square battery cover body as an injection hole, and a plug needs to be set on the injection hole. The injection hole can be sealed when injection is not needed, and the plug can be removed when injection is needed.

[0003] At present, some batteries need to inject electrolyte several times during the manufacturing process, so the cover plate of the battery is usually provided with a liquid injection hole. After the battery is injected once, a formation nail (rubber nail) is usually used to block the injection hole to achieve a temporary sealing process, and the formation nail is taken out to open the injection hole when the battery is injected again. In the above method, the formation nail needs to be taken out and loaded several times during the battery production process, which increases the production process and results in a low production efficiency of the battery. Utility Model Content

[0004] The utility model provides a battery liquid injection structure and a battery, aiming to reduce the processes in the battery production process and improve the battery production efficiency.

[0005] To achieve the above-mentioned purpose, the battery injection structure proposed by the utility model includes:

[0006] A cover plate, provided with a liquid injection hole;

[0007] A valve seat, which is arranged on the inner side of the cover plate at a position corresponding to the injection hole, and at least one through hole is arranged on the inner wall of the valve seat;

[0008] An opening and closing member, movably disposed in the valve seat;

[0009] an elastic member, disposed in the valve seat, the elastic member exerting a force on the opening and closing member toward the injection hole to keep the opening and closing member in a closed state;

[0010] When the opening and closing member is in the closed state, the through hole is not connected to the injection hole; when the opening and closing member is subjected to an external force that overcomes the force applied by the elastic member, the opening and closing member switches to the open state, so that at least one of the through holes is connected to the injection hole.

[0011] In some embodiments, the opening and closing member and the valve seat are slidably matched in the axial direction of the liquid injection hole.

[0012] In some embodiments, a guide structure is provided between the opening and closing member and the valve seat for guiding the sliding of the opening and closing member along the axial direction of the injection hole.

[0013] In some embodiments, one end of the opening and closing member is hinged to the valve seat, and the elastic member applies a force toward the injection hole to the other end of the opening and closing member.

[0014] In some embodiments, a first sealing member is provided on a side of the opening and closing member facing the injection hole, and the opening and closing member, in the closed state, covers one end of the injection hole located on the inner side of the cover plate, and the first sealing member abuts against the periphery of the injection hole;

[0015] Alternatively, a second sealing member is provided at the periphery of one end of the injection hole located on the inner side of the cover plate, and the opening and closing member, in the closed state, covers the end of the injection hole located on the inner side of the cover plate, and the second sealing member abuts against the opening and closing member;

[0016] Alternatively, a first sealing member is provided on the side of the opening and closing member facing the injection hole, and a second sealing member is provided on the periphery of one end of the injection hole located on the inner side of the cover plate, and the second sealing member is a sealing member matching the first sealing member. When the opening and closing member is in the closed state, the opening and closing member seals one end of the injection hole located on the inner side of the cover plate, and the second sealing member abuts against the first sealing member.

[0017] In some embodiments, a boss is provided on the inner side of the cover plate, the injection hole passes through the boss, and the valve seat is sleeved on the boss;

[0018] Alternatively, an annular groove surrounding the injection hole is provided on the inner side of the cover plate, and the valve seat is inserted into the annular groove.

[0019] In some embodiments, the elastic member includes a first spring in a compressed state, and the first spring is located on a side of the opening and closing member facing away from the liquid injection hole;

[0020] And / or, the elastic member includes a second spring in a stretched state, and the second spring is located on a side of the opening and closing member facing the liquid injection hole.

[0021] In some embodiments, the through hole is provided on a peripheral wall of the valve seat surrounding the injection hole, or the through hole is provided on an end wall of the valve seat away from the cover plate;

[0022] When the opening and closing member is in the closed state, the through hole and the liquid injection hole are respectively located on two sides of the opening and closing member; when the opening and closing member is in the open state, the through hole and the liquid injection hole are located on the same side of the opening and closing member.

[0023] In some embodiments, one end of the valve seat close to the cover plate is sealed and fixedly connected to the cover plate;

[0024] Alternatively, the valve seat and the cover plate are integrally formed.

[0025] The utility model also provides a battery, comprising the above-mentioned battery liquid injection structure.

[0026] The technical solution of the utility model is that the liquid injection structure adopts a valve seat arranged on the inner side of the cover plate corresponding to the liquid injection hole, and an opening and closing member and an elastic member are arranged in the valve seat, the elastic member applies a force toward the liquid injection hole to the opening and closing member, so that the opening and closing member keeps the liquid injection hole in a closed state, so that the liquid injection hole is not connected with the through hole on the valve seat, that is, the liquid injection hole is not connected with the inside of the battery, so that the battery using the liquid injection structure of the utility model keeps the liquid injection hole closed in a natural state to prevent leakage; when the battery needs to be injected, it is only necessary to use an object (such as a push rod) to insert it from the liquid injection hole and apply a thrust to the battery, so that the push rod pushes the opening and closing member to move and switch to an open state, so that the liquid injection hole is connected with the through hole, that is, the liquid injection hole is connected with the inside of the battery, and at this time, electrolyte can be injected into the battery through the liquid injection hole; and after the injection is completed, the thrust of the object on the opening and closing member is removed, and the opening and closing member will automatically return to a closed state under the action of the elastic member, that is, the liquid injection hole is automatically closed. Compared with the prior art method of using formation nails to seal the injection hole, the solution of the utility model does not need to carry out the process of removing and inserting the formation nails during the injection process in the battery production process, thereby reducing the battery production process and improving the battery production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic cross-sectional structure diagram of a battery liquid injection structure in an embodiment of the utility model when the opening and closing member is in a closed state;

[0028] Figure 2 It is a schematic cross-sectional structure diagram of a battery liquid injection structure in an embodiment of the utility model when the opening and closing member is in an open state;

[0029] Figure 3 for Figure 1 A partial structural diagram of the embodiment;

[0030] Figure 4 for Figure 1 Partial structural diagram of the embodiment.

[0031] Description of the accompanying drawings: 10 - cover plate, 20 - valve seat, 30 - opening and closing member, 40 - elastic member, 50 - first sealing member, 60 - second sealing member, 11 - liquid injection hole, 21 - through hole. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0035] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0036] The utility model provides a battery liquid injection structure, which can be a liquid injection structure of a cylindrical battery, a liquid injection structure of a square battery, or a liquid injection structure of other types of batteries.

[0037] See also Figure 1 and Figure 2 In this embodiment, the liquid injection structure of the battery includes a cover plate 10, a valve seat 20, an opening and closing member 30 and an elastic member 40. The cover plate 10 is provided with a liquid injection hole 11. The position of the valve seat 20 corresponding to the liquid injection hole 11 is arranged on the inner side of the cover plate 10 (that is, the side of the cover plate 10 facing the inside of the battery when assembled on the battery), and at least one through hole 21 is arranged on the inner wall of the valve seat 20; the opening and closing member 30 is movably arranged in the valve seat 20, that is, the opening and closing member 30 can move in the valve seat 20; the elastic member 40 is arranged in the valve seat 20, and the elastic member 40 applies a force toward the liquid injection hole 11 to the opening and closing member 30, so that the opening and closing member 30 remains in a closed state ( Figure 1 status shown).

[0038] When the liquid injection structure is assembled on the battery, the inner side of the cover plate 10 faces the inside of the battery, so the valve seat 20 is located inside the battery. Figure 1 ), the through hole 21 is not connected to the injection hole 11, that is, the injection hole 11 is not connected to the inside of the battery, and the injection hole 11 is closed, that is, when the battery is in a natural state, the injection hole 11 remains closed and does not leak. When the opening and closing member 30 is subjected to an external force that overcomes the force applied by the elastic member 40, that is, an external force is applied to the opening and closing member 30 in the direction opposite to the injection hole 11 (for example, an object is inserted into the injection hole 11 from the outside of the cover plate 10 to apply a thrust to the opening and closing member 30), and the magnitude of the external force is greater than the elastic force of the elastic member 40, at this time, the opening and closing member 30 moves in the valve seat 20 under the action of the external force to switch to the open state (refer to Figure 2 ), so that at least one through hole 21 is connected to the injection hole 11, that is, the injection hole 11 is connected to the inside of the battery through the through hole 21, and electrolyte can be injected into the battery through the injection hole 11. When the external force on the opening and closing member 30 is removed, the opening and closing member 30 will automatically move back to the closed state under the action of the elastic member 40 to close the injection hole 11.

[0039] The through hole 21 may be arranged on the peripheral wall of the valve seat 20, or on the end wall of the valve seat 20 away from the cover plate 10. In the figure of this embodiment, the through hole 21 is arranged on the peripheral wall of the valve seat 20 as an example. The number of through holes 21 may be one or more (two are shown as an example in the figure). Each through hole 21 may be arranged at the same axial distance from the injection hole 11, or at different axial distances from the injection hole 11.

[0040] In this embodiment, the opening and closing member 30 is taken as an example of a plate-shaped structure. Of course, in other embodiments, the opening and closing member 30 may also be in other shapes.

[0041] In some embodiments, one end of the valve seat 20 close to the cover plate 10 is sealed and fixedly connected to the cover plate 10. For example, one end of the valve seat 20 close to the cover plate 10 is welded to the inner side of the cover plate 10, or one end of the valve seat 20 close to the cover plate 10 is glued to the inner side of the cover plate 10; of course, the valve seat 20 and the cover plate 10 can also be connected by other commonly used fixing methods (such as detachable fixing methods) and sealing methods.

[0042] In some embodiments, the valve seat 20 may also be integrally formed with the cover plate 10; when the valve seat 20 and the cover plate 10 are integrally formed, the end of the valve seat 20 away from the cover plate 10 may be opened, and the opening may serve as a through hole 21 set on the inner wall of the valve seat 20, and the opening and closing member 30 and the spring may be installed into the valve seat 20 from the open end.

[0043] The elastic member 40 may be a spring, an elastic rubber block, an elastic airbag, etc. In some embodiments, the elastic member 40 includes a first spring in a compressed state, the first spring is located on the side of the opening and closing member 30 facing away from the injection hole 11, and the first spring generates a thrust force on the opening and closing member 30 toward the injection hole 11. In other embodiments, the elastic member 40 includes a second spring in a stretched state (which may also be replaced by an elastic rope), the second spring is located on the side of the opening and closing member 30 facing the injection hole 11, and the second spring generates a pulling force on the opening and closing member 30 toward the injection hole 11. In some embodiments, the elastic member 40 may also include both the first spring and the second spring described above.

[0044] The technical solution of the liquid injection structure of the battery of this embodiment adopts a method of setting a valve seat 20 on the inner side of the cover plate 10 corresponding to the liquid injection hole 11, and setting an opening and closing member 30 and an elastic member 40 in the valve seat 20. The elastic member 40 applies a force toward the liquid injection hole 11 to the opening and closing member 30, so that the opening and closing member 30 keeps the liquid injection hole 11 closed, so that the liquid injection hole 11 is not connected to the through hole 21 on the valve seat 20, that is, the liquid injection hole 11 is not connected to the inside of the battery, so that the battery using the liquid injection structure of this embodiment keeps the liquid injection hole 11 closed in a natural state, preventing Leakage; when the battery needs to be injected, it is only necessary to insert an object (such as a push rod) from the injection hole 11 and apply a thrust to the battery, so that the push rod pushes the opening and closing member 30 to move and switch to the open state, and then the injection hole 11 is connected with the through hole 21, that is, the injection hole 11 is connected with the inside of the battery. At this time, electrolyte can be injected into the battery through the injection hole 11; and after the injection is completed, the thrust of the object on the opening and closing member 30 is removed, and the opening and closing member 30 will automatically return to the closed state under the action of the elastic member 40, that is, the injection hole 11 is automatically closed. Compared with the prior art method of using a formation nail to seal the injection hole 11, the present embodiment does not need to perform the process of removing and inserting the formation nail in the injection process of the battery production process, which reduces the process of battery production and improves the production efficiency of the battery.

[0045] In addition, the prior art adopts a method of sealing the injection hole 11 with a formation nail. When gas is generated after the battery is formed, the internal air pressure of the battery increases, which easily pushes the formation nail out of the injection hole 11, and thus easily causes the battery to leak. However, in the present embodiment, when gas is generated after the battery is formed and the internal air pressure increases, the force exerted by the internal air pressure on the opening and closing member 30 is toward the injection hole 11, which is consistent with the direction of the force exerted by the elastic member 40 on the opening and closing member 30, which only makes the opening and closing member 30 more stably maintain the state of closing the injection hole 11, effectively avoiding the occurrence of battery leakage.

[0046] The internal space of the valve seat 20 may be a cylindrical cavity, a rectangular cavity, or a cavity of other shapes.

[0047] In some embodiments, the movable setting mode of the opening and closing member 30 can be: the opening and closing member 30 and the valve seat 20 are slidably matched in the axial direction of the injection hole 11, that is, the opening and closing member 30 can slide back and forth in the valve seat 20 along the axial direction of the injection hole 11, and the opening and closing member 30 can switch between the closed state and the open state by sliding back and forth in the valve seat 20.

[0048] In some embodiments, a guide structure is provided between the opening and closing member 30 and the valve seat 20, which is used to guide the sliding of the opening and closing member 30 along the axial direction of the injection hole 11. The guide structure, for example, includes a slide groove provided on the inner wall of the valve seat 20 and a slider provided on the opening and closing member 30, the slider slides in the slide groove, and the guide structure may also be other common guiding structures. In this embodiment, by adding a guide structure to guide the sliding of the opening and closing member 30, the opening and closing member 30 can slide more stably and smoothly relative to the valve seat 20 along the axial direction of the injection hole 11.

[0049] In other embodiments, the movable arrangement of the opening and closing member 30 can also be: one end of the opening and closing member 30 is hinged to the valve seat 20, and the elastic member 40 applies a force toward the injection hole 11 to the other end of the opening and closing member 30, that is, the opening and closing member 30 can rotate around the end hinged to the valve seat 20, and the opening and closing member 30 can switch between the closed state and the open state by rotating back and forth in the valve seat 20.

[0050] In some embodiments, when the opening and closing member 30 is in a closed state, the through hole 21 and the liquid injection hole 11 are respectively located on both sides of the opening and closing member 30, the through hole 21 and the liquid injection hole 11 are blocked and separated by the opening and closing member 30, and the through hole 21 and the liquid injection hole 11 are not connected; when the opening and closing member 30 is in an open state, the through hole 21 and the liquid injection hole 11 are located on the same side of the opening and closing member 30, there is no obstruction of the opening and closing member 30 between the through hole 21 and the liquid injection hole 11, and the through hole 21 and the liquid injection hole 11 are connected.

[0051] If the opening and closing member 30 and the valve seat 20 are in sliding cooperation, when the opening and closing member 30 slides in a direction away from the injection hole 11 (for example, sliding downward) under the action of an external force, it slides to a position exceeding the through hole 21 (for example, sliding downward to a position lower than the through hole 21). At this time, the injection hole 11 and the through hole 21 are located on the same side of the opening and closing member 30 (for example, the upper side), and there is no obstruction of the opening and closing member 30 between the injection hole 11 and the through hole 21, and the injection hole 11 is connected with the through hole 21; when the external force on the opening and closing member 30 is removed, the opening and closing member 30 slides and resets in a direction close to the injection hole 11 (for example, sliding upward) under the action of the elastic member 40, and the through hole 21 and the injection hole 11 are respectively located on both sides of the opening and closing member 30, and the through hole 21 and the injection hole 11 are blocked and separated by the opening and closing member 30, and the through hole 21 and the injection hole 11 are not connected. If the opening and closing member 30 and the valve seat 20 are hinged, then when the opening and closing member 30 is subjected to the action of an external force, the other end of the opening and closing member 30 rotates around its hinged end in a direction away from the injection hole 11 (for example, rotates downward), and rotates to a position where the other end exceeds the through hole 21 (such as rotating downward to a position where the other end is lower than the through hole 21). At this time, the injection hole 11 and the through hole 21 are located on the same side of the opening and closing member 30, and there is no obstruction of the opening and closing member 30 between the injection hole 11 and the through hole 21, and the injection hole 11 is connected with the through hole 21; when the external force on the opening and closing member 30 is removed, the other end of the opening and closing member 30 is rotated and reset in a direction close to the injection hole 11 (such as rotating upward and resetting) under the action of the elastic member 40, and the through hole 21 and the injection hole 11 are respectively located on both sides of the opening and closing member 30, and the through hole 21 and the injection hole 11 are blocked and separated by the opening and closing member 30, and the through hole 21 and the injection hole 11 are not connected.

[0052] refer to Figure 2 and Figure 4 In some embodiments, a first sealing member 50 is provided on the side of the opening and closing member 30 facing the injection hole 11. When the opening and closing member 30 is in the closed state, the opening and closing member 30 seals the injection hole 11 at one end located on the inner side of the cover plate 10 (i.e., the end of the injection hole 11 close to the opening and closing member 30), and the first sealing member 50 abuts against the periphery of the injection hole 11 to achieve the closure of the injection hole 11 by the opening and closing member 30. The abutment of the first sealing member 50 with the periphery of the injection hole 11 ensures the sealing effect of the opening and closing member 30 sealing the injection hole 11.

[0053] refer to Figure 2 and Figure 3 In some embodiments, a second sealing member 60 is provided on the periphery of one end of the liquid injection hole 11 located on the inner side of the cover plate 10. When the opening and closing member 30 is in the closed state, the opening and closing member 30 seals the end of the liquid injection hole 11 located on the inner side of the cover plate 10, and the second sealing member 60 abuts against the opening and closing member 30 to achieve the closure of the liquid injection hole 11 by the opening and closing member 30. The abutment between the second sealing member 60 and the opening and closing member 30 ensures the sealing effect of the opening and closing member 30 sealing the liquid injection hole 11.

[0054] Combined with reference Figures 1 to 4 In some embodiments, a first sealing member 50 is provided on the side of the opening and closing member 30 facing the injection hole 11, and a second sealing member 60 is provided on the periphery of one end of the injection hole 11 located on the inner side of the cover plate 10. The second sealing member 60 is a sealing member matching the first sealing member 50. When the opening and closing member 30 is in a closed state, the opening and closing member 30 seals one end of the injection hole 11 located on the inner side of the cover plate 10, and the second sealing member 60 abuts against the first sealing member 50. Due to the use of the matching first sealing member 50 and second sealing member 60, the sealing effect of the opening and closing member 30 sealing the injection hole 11 is better guaranteed.

[0055] The first seal 50 and the second seal 60 may be sealing components such as sealing strips and sealing rings. The first seal 50 and the second seal 60 may be matched, for example, as follows: a groove is provided on the side of the first seal 50 facing the second seal 60, and a strip is provided on the side of the second seal 60 facing the first seal 50, and the strip is adapted or interference fit with the groove; of course, other matching solutions are also possible.

[0056] In some embodiments, a boss is provided on the inner side of the cover plate 10, the injection hole 11 passes through the boss, and the valve seat 20 is sleeved on the boss. In this embodiment, by providing the boss and the valve seat 20 being sleeved on the boss, the fixed connection between the valve seat 20 and the cover plate 10 can be positioned by sleeved on the boss first, and the fixation of the valve seat 20 to the cover plate 10 is more convenient; and by providing the boss, the end of the injection hole 11 close to the opening and closing member 30 extends into the valve seat 20, so that the sealing of the injection hole 11 by the opening and closing member 30 is more stable and reliable.

[0057] In other embodiments, an annular groove surrounding the injection hole 11 may be provided on the inner side of the cover plate 10, and the valve seat 20 is inserted into the annular groove. In this embodiment, the valve seat 20 is positioned by being inserted into the annular groove, so that the valve seat 20 is more convenient to fix with the cover plate 10, and by providing a groove, the end of the injection hole 11 close to the opening and closing member 30 extends into the valve seat 20, so that the opening and closing member 30 covers the injection hole 11 more stably and reliably.

[0058] The utility model also provides a battery, including the above-mentioned battery injection structure. The specific structure of the battery injection structure refers to the above-mentioned embodiment. Since the battery adopts all the technical solutions of all the embodiments of the battery injection structure, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here. Among them, the battery can be, for example, a cylindrical battery, a square battery, etc.

[0059] The above description is only a partial or preferred embodiment of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A battery injection structure, characterized in that: include: A cover plate, provided with a liquid injection hole; A valve seat, which is arranged on the inner side of the cover plate at a position corresponding to the injection hole, and at least one through hole is arranged on the inner wall of the valve seat; An opening and closing member, movably disposed in the valve seat; an elastic member, disposed in the valve seat, the elastic member exerting a force on the opening and closing member toward the injection hole to keep the opening and closing member in a closed state; When the opening and closing member is in the closed state, the through hole is not connected to the injection hole; when the opening and closing member is subjected to an external force that overcomes the force applied by the elastic member, the opening and closing member switches to the open state, so that at least one of the through holes is connected to the injection hole.

2. The battery injection structure according to claim 1, characterized in that: The opening and closing member and the valve seat are slidably matched in the axial direction of the liquid injection hole.

3. The battery injection structure according to claim 2, characterized in that: A guide structure is provided between the opening and closing member and the valve seat, for guiding the sliding of the opening and closing member along the axial direction of the liquid injection hole.

4. The battery injection structure according to claim 1, characterized in that: One end of the opening and closing member is hinged to the valve seat, and the elastic member applies a force toward the liquid injection hole to the other end of the opening and closing member.

5. The battery liquid injection structure according to any one of claims 1 to 4, characterized in that: A first sealing member is provided on one side of the opening and closing member facing the liquid injection hole. When the opening and closing member is in the closed state, the opening and closing member covers one end of the liquid injection hole located on the inner side of the cover plate, and the first sealing member abuts against the periphery of the liquid injection hole. Alternatively, a second sealing member is provided at the periphery of one end of the injection hole located on the inner side of the cover plate, and the opening and closing member, in the closed state, covers the end of the injection hole located on the inner side of the cover plate, and the second sealing member abuts against the opening and closing member; Alternatively, a first sealing member is provided on the side of the opening and closing member facing the injection hole, and a second sealing member is provided on the periphery of one end of the injection hole located on the inner side of the cover plate, and the second sealing member is a sealing member matching the first sealing member. When the opening and closing member is in the closed state, the opening and closing member seals one end of the injection hole located on the inner side of the cover plate, and the second sealing member abuts against the first sealing member.

6. The battery injection structure according to claim 5, characterized in that: A boss is provided on the inner side of the cover plate, the injection hole passes through the boss, and the valve seat is sleeved on the boss; Alternatively, an annular groove surrounding the injection hole is provided on the inner side of the cover plate, and the valve seat is inserted into the annular groove.

7. The battery liquid injection structure according to any one of claims 1 to 4, characterized in that: The elastic member includes a first spring in a compressed state, and the first spring is located on a side of the opening and closing member facing away from the liquid injection hole; And / or, the elastic member includes a second spring in a stretched state, and the second spring is located on a side of the opening and closing member facing the liquid injection hole.

8. The battery liquid injection structure according to any one of claims 1 to 4, characterized in that: The through hole is arranged on a peripheral wall of the valve seat surrounding the injection hole, or the through hole is arranged on an end wall of the valve seat away from the cover plate; When the opening and closing member is in the closed state, the through hole and the liquid injection hole are respectively located on two sides of the opening and closing member; when the opening and closing member is in the open state, the through hole and the liquid injection hole are located on the same side of the opening and closing member.

9. The battery liquid injection structure according to any one of claims 1 to 4, characterized in that: One end of the valve seat close to the cover plate is sealed and fixedly connected to the cover plate; Alternatively, the valve seat and the cover plate are integrally formed.

10. A battery, characterized in that: A liquid injection structure for a battery comprising any one of claims 1 to 9.

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